root@freebsd-dns:/boot # kldstat
Id Refs Address Size Name
1 19 0xffff000000000000 1209308 kernel
2 1 0xffff00000120b000 25808 umodem.ko
3 2 0xffff000001231000 28698 ucom.ko
4 1 0xffff0000c9200000 5c000 pf.ko
5 1 0xffff0000c925c000 22000 mac_ntpd.ko
6 1 0xffff0000ca000000 453000 zfs.ko
root@freebsd-dns:/boot # kldunload zfs.ko
root@freebsd-dns:/boot # kldstat
Id Refs Address Size Name
1 11 0xffff000000000000 1209308 kernel
2 1 0xffff00000120b000 25808 umodem.ko
3 2 0xffff000001231000 28698 ucom.ko
4 1 0xffff0000c9200000 5c000 pf.ko
5 1 0xffff0000c925c000 22000 mac_ntpd.ko